ionic 2.0.0-alpha.54 发布，更新如下：
Bug 修复
alert: add checkbox icon for iOS using Sass variables from regular checkbox (68819f0), closes #5253
badge: change default badge color to primary (93b9891), closes #5222
badge: split badge color into separate modes (b472c6c)
css: minor updates to match previous snapshots (9749b06)
input: add/remove disabled on native text input (11b8e08), closes #5280
input: check has value on writeValue (181a070)
input: parent Item is optional (db6f4bc)
prepare: add missing require to prepare task (b2f7278)
scrollbars: do not apply css scrollbars (f3fb182)
select: always update value and text (58443f0)
select: null value clears select text (c264e31), closes #5288
特性
button: increase hit area of toolbar buttons (cad9e49)
checkbox: add bg transition to md checkbox (8466d39)
overlay: fire the cancel handler when dismissing from backdrop (1c618b5)
scrollbars: webkit scrollbar styling for desktop (c7f2268)
下载地址：https://github.com/driftyco/ionic/tree/v2.0.0-alpha.54
来自:开源中国社区
